将文本写入透明UIImage

// 导入必要的框架
import UIKit

// 创建一个函数，将文本写入透明UIImage
func addTextToImage(text: String, image: UIImage) -> UIImage? {
    // 设置文本属性
    let textFontAttributes = [
        NSAttributedString.Key.font: UIFont.systemFont(ofSize: 12),
        NSAttributedString.Key.foregroundColor: UIColor.white
    ]
    
    // 创建一个图形上下文
    UIGraphicsBeginImageContextWithOptions(image.size, false, 0)
    
    // 在图形上下文中绘制图像
    image.draw(in: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
    
    // 在图形上下文中绘制文本
    let rect = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)
    text.draw(in: rect, withAttributes: textFontAttributes)
    
    // 从图形上下文中获取新的图像
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    
    // 结束图形上下文
    UIGraphicsEndImageContext()
    
    return newImage
}

// 使用示例
let originalImage = UIImage(named: "original_image.png")
let text = "Hello, World!"
let imageWithText = addTextToImage(text: text, image: originalImage)